ACC to DirectX X Converter
FileFlip converts ACC to DirectX X entirely inside your browser, using Assimp compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert an ACC file to DirectX X?#
- Drop your ACC file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to DirectX X and the conversion starts on its own. FileFlip downloads 11.2 MB of WebAssembly the first time and nothing after that, then runs Assimp on your own machine.
- Save the DirectX X file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting ACC to DirectX X lose quality?#
Not in the sense of pixels or samples. Converting ACC to DirectX X rebuilds the file in DirectX X's own model rather than re-encoding it, so everything DirectX X can represent comes through exactly and anything it cannot has to be dropped. Expect the geometry to be exact, and anything the target has no place for, such as a rig, to be left behind.
Is it safe to convert ACC files online?#
Yes, because nothing is uploaded. FileFlip converts ACC files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What ACC to DirectX X actually does to the file#
Converting ACC to DirectX X runs on Assimp, downloads 11.2 MB of WebAssembly the first time and nothing after that, rebuilds the file in the target's own model.
| Engine | Assimp |
|---|---|
| Conversion path | One step: ACC → DirectX X |
| Downloaded to your browser | 11.2 MB, once, then cached by your browser |
| Quality | Rebuilt in the target's model |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| Materials | Sometimes | Survives for some files and not others. |
| Textures | Sometimes | Survives for some files and not others. |
| Skeleton and animation | Sometimes | Survives for some files and not others. |
What is an ACC file?#
An ACC file is AC3D's plain-text .ac format with one addition, a triangle-strip surface type that TORCS and Speed Dreams use for car and track models with smoothing and baked shadow mapping that plain AC3D scenery doesn't carry.
Use ACC when building or editing a car or track for TORCS or Speed Dreams, since their tools expect the extra surface type.
Convert ACC to OBJ or glTF for anything outside the TORCS and Speed Dreams pipelines, where the format is rarely supported.
What is an DirectX X file?#
An X file is Microsoft's DirectX mesh format, storing geometry, materials, textures, skinning and animation as a set of typed data templates, in either a human-readable text encoding or a tokenised binary one.
Use X only to keep compatibility with older DirectX SDK samples or a legacy pipeline built around the format.
Convert X to FBX or glTF for any current game or graphics pipeline, since DirectX itself has moved on from the format.
ACC to DirectX X questions people ask#
What is an ACC file?
An ACC file is a 3D car or track model in the format TORCS and Speed Dreams use, which is AC3D's plain-text .ac format plus one added surface type for triangle strips. Track designers commonly build it with Blender using a community ACC import/export script, or generate it with the trackgen tool.
Is ACC the same format as AC3D's AC file?
Almost. ACC shares the same object hierarchy, materials and text structure as an AC3D .ac file, so the same parser handles both. The only difference is a triangle-strip surface type TORCS and Speed Dreams added for smoother, shadow-mapped car and track geometry.
Can AC3D open ACC files?
Yes, AC3D opens ACC files the same way it opens .ac files, since the underlying format is identical apart from the added surface type. Racing-sim tools like TORCS and Speed Dreams are what actually make use of that extra data.
What is a DirectX X file used for?
An X file stores a 3D mesh for Microsoft's DirectX, including materials, textures, skinning and animation, laid out as a set of typed templates. It was the standard model format across the DirectX SDK samples through the 1990s and 2000s.